His work includes Gossip Girl,[1] The Good Wife,[2] Person of Interest,[3] Blue Bloods,[4] The Blacklist,[5] Boardwalk Empire,[6] and the dramatic films Maybe Tomorrow[7] and An Act of War.

He enrolled in the Medical School of the University Zurich, and after receiving his MD Degree worked for two years in the Neurosurgical Department of the Cantonal Hospital in St. Gallen, Switzerland.

[12] In August 2019, after The Lehman Trilogy had moved to the Piccadilly Theatre in the London West End, Tiefenthaler took over the role of Emanuel from Ben Miles and finished the last four weeks of the run alongside Simon Russell Beale and Adam Godley.

[13] In 2010, Tiefenthaler portrayed Swiss detective Yan Glassey, the lead investigator of the infamous Pink Panthers, an international gang of jewelry thieves[14][failed verification], in an episode of America's Most Wanted.

"),[2] Person of Interest ("Relevance"),[3] Blue Bloods ("Worst Case Scenario"),[4] and NYC 22 ("Self Cleaning Oven"),[17] NBC's The Blacklist ("The Good Samaritan"),[5] abc's Zero Hour ("Chain") (opposite Anthony Edwards),[18] and HBO's Boardwalk Empire ("All In").